Self-assembled multimodal imaging nanoparticles (SAMINs) are comprised of two different types of modified HA: fluorescent HA and paramagnetic
De Jonge, "Electron paramagnetic
resonance knight shift in semimagnetic (diluted magnetic) semiconductors," Physical Review Letters, vol.
In homogeneous systems with small amount of paramagnetic
species, [T.sub.2e] is inversely proportional to the concentration of paramagnetic
centers and very sensitive to the changes in their local surrounding [17, 28].
where [N.sub.u]--the number of paramagnetic
center in the ultramarine reference; W, [W.sub.u]--the receiver gains for sample and the ultramarine; A, [A.sub.u]--the amplitudes of ruby signal for the sample and the ultramarine; I, [I.sub.u]--the integral intensities for the sample and ultramarine; m--the mass of the sample.
This result is shown in Figure 3.The [La.sub.0.7][Ca.sub.0.24][Sr.sub.0.06]Mn[O.sub.3] single crystal undergoes a phase transition from paramagnetic
to a ferromagnetic state at the Curie temperature [T.sub.c]= 277 K.
g-Factors were calculated from the paramagnetic
resonance condition according to the formula : g = hv/[[mu].sub.B][B.sub.r], where h--Planck constant, v--microwave frequency, [[mu].sub.B]-Bohr magneton, and [B.sub.r]--induction of resonance magnetic field.
Magnetic measurements showed that the nanocrystal formed by ultrasonic radiation had super paramagnetic
properties," she added.
These include increasing the echo time, which allows greater time for the dephasing of the paramagnetic
signal; thinner scanning sections, which increase the signal-to-noise ratio; increasing the magnetic field strength; and image postprocessing techniques such as susceptibility-weighted imaging, which "incorporates the phase shift as well as the magnitude effects of the iron deposits to increase their visibility."
We also studied the Cu(II)-frataxin complexes by electron paramagnetic
Compared with conventional [T.sub.2]-weighted MRI, [T.sub.2.sup.*]-weighted MRI does not use a refocusing pulse, "so the dephasing caused by the paramagnetic
iron is accentuated by the [T.sub.2.sup.*]-weighted technique," Dr.
resonance (EPR) spectra were recorded on a Varian E-3 X-band spectrometer at 77 K and at room temperature.
At the Curie-Point, the relative permeability of the sample carrier falls suddenly and the status changes instantaneously from ferromagnetic to paramagnetic